BlueSPP is a Bluetooth SPP communication tool. It can connect any supporting the Serial Port Profile Bluetooth devices (like cellphone, MCU, Arduino or Raspberry Pi).

BlueSPP features:

Search for Bluetooth devices.
Supports Bluetooth client and Bluetooth server mode.
Select an appropriate character set to communicate.
Keyboard view, you can customize buttons.
Can be used to communicate with other android phone.
Can be set to ASCII or HEX display mode.
Can be set to terminal or chat view.
Can connect to a Bluetooth MCU.
Can connect to a Bluetooth Modem (most cellphone support).

For Windows Phone http://www.windowsphone.com/s?appid=7424bd0e-2757-4f75-b80b-f4beb14db218